Feluda and his cousin Topshe visit Lucknow with Topshe's father to spend the Puja vacation. They arrive at the house of Dhirendra Kumar Sanyal, a friend of Topshe's father. That evening Dr. Shrivastav also comes to Dhirendra Kumar Sanyal and tells him that last night, a thief tried to steal his 'Ring of Aurangzeb' (The Emperor's Ring) which was given to him by Pyarilaal Seth. After the incident Dr. Shrivastav is afraid and asks Dhirendra Kumar Sanyal to keep the ring safe. Sanyal agrees and keeps the ring at his home. But one day the ring goes missing from there.